added new issue templates

.github/ISSUE_TEMPLATE/bug-report-for-adminlte-v2-4-x.md

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+---
+name: Bug report for AdminLTE v2.4.x
+about: Create a report to help us improve AdminLTE v2.4.x
+title: "[BUG]"
+labels: bug
+assignees: ''
+
+---
+
+**Describe the bug**
+A clear and concise description of what the bug is.
+
+**To Reproduce**
+Steps to reproduce the behavior:
+1. Go to '...'
+2. Click on '....'
+3. Scroll down to '....'
+4. See error
+
+**Expected behavior**
+A clear and concise description of what you expected to happen.
+
+**Screenshots**
+If applicable, add screenshots to help explain your problem.
+
+**Environment (please complete the following information):**
+ - AdminLTE Version: [e.g. v2.4.18]
+ - Operating System:  [e.g. macOS Catalina]
+ - Browser (Version): [e.g. Chrome (Latest)]
+
+**Additional context**
+Add any other context about the problem here.

.github/ISSUE_TEMPLATE/bug-report-for-adminlte-v3-x.md

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+---
+name: Bug report for AdminLTE v3.x
+about: Create a report to help us improve AdminLTE v3.x
+title: "[BUG]"
+labels: bug
+assignees: ''
+
+---
+
+**Describe the bug**
+A clear and concise description of what the bug is.
+
+**To Reproduce**
+Steps to reproduce the behavior:
+1. Go to '...'
+2. Click on '....'
+3. Scroll down to '....'
+4. See error
+
+**Expected behavior**
+A clear and concise description of what you expected to happen.
+
+**Screenshots**
+If applicable, add screenshots to help explain your problem.
+
+**Environment (please complete the following information):**
+ - AdminLTE Version: [e.g. v3.0.0]
+ - Operating System:  [e.g. macOS Catalina]
+ - Browser (Version): [e.g. Chrome (Latest)]
+
+**Additional context**
+Add any other context about the problem here.

.github/ISSUE_TEMPLATE/feature-request-for-adminlte-v3-x.md

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+---
+name: Feature request for AdminLTE v3.x
+about: Suggest an idea for this project
+title: "[FEATURE]"
+labels: enhancement
+assignees: ''
+
+---
+
+**Is your feature request related to a problem? Please describe.**
+A clear and concise description of what the problem is. Ex. I'm always frustrated when [...]
+
+**Describe the solution you'd like**
+A clear and concise description of what you want to happen.
+
+**Describe alternatives you've considered**
+A clear and concise description of any alternative solutions or features you've considered.
+
+**Additional context**
+Add any other context or screenshots about the feature request here.